Cooling Tower Fan Cylinder

ABSTRACT

A segmented/modular cooling tower fan cylinder having basic segments, a motor segment and an access segment, assembled to form an hourglass shaped cooling tower fan cylinder to protect fan blades, reduce sound and vibration, and enhance performance. The segments are preferably molded fiberglass composite structures having integrally molded vertical and horizontal ribs and a horizontal rib stiffener which connects horizontal ribs of adjacent segments. A top ring stiffener is provided at the junction of each two adjacent segments in the top ring flange. Lifter bars may be provided inside a central vertical rib of the segment to secure cables or straps to hoist an assembled fan cylinder into its final location or to secure a safety harness for workers servicing equipment in the interior space defined by the fan cylinder.

BACKGROUND OF THE INVENTION Field of The Invention

The present invention relates to fan cylinders for cooling towers.

SUMMARY OF THE INVENTION

The present invention is an improved modular cooling tower fan cylinder composed of multiple modules or “segments,” including a plurality of basic segments, a motor segment and an access segment. The segments are assembled, preferably at ground level, to form a generally hourglass shaped cooling tower fan cylinder which then may be hoisted atop a cooling tower or other structure. The fan cylinder according to the invention is configured to house and protect fan blades, reduce sound and vibration, and enhance performance. The segments are preferably molded fiberglass composite structures, including a wall element having interior and exterior facing surfaces. According to preferred embodiments, the interior facing surface of the wall element of each basic segment is smooth and relatively featureless (with the exception in at least some instances of a lifting bar, discussed below). The exterior facing surface of the wall element of each segment features integrally molded vertical and horizontal ribs that intersect with one-another at right angles. At their lateral edges, the segments have flanges which are used to bolt the segments to one-another. According to a preferred embodiment, the fan cylinders of the present invention include a horizontal rib stiffener which attaches at one end to a horizontal rib of one segment and at a second end to the corresponding horizontal rib of the adjacent segment. According to a more preferred embodiment, at least one horizontal rib stiffener is at every junction between adjacent segments. According to a further embodiment, two rib stiffeners are provided at each junction between adjacent segments to join two horizontal ribs in the throat area of the fan cylinder. According to another embodiment of the invention, a top ring stiffener is provided at the junction of each two adjacent segments in the top ring flange.

According to a further embodiment of the invention, at least three segments are provided with a lifter bar, accessible from the inside surface of the wall. According to a preferred embodiment, the lifter bar is horizontally secured to a lifter cup holder that is integrally molded inside a central vertical rib of the segment. The lifter bar may be used to secure cables or straps to hoist an assembled fan cylinder into its final location. The lifter bar may also be used to secure a safety harness for workers servicing equipment in the interior space defined by the fan cylinder. The height of the lifter bar from the bottom of the segment is preferably arranged to make it convenient for use both as a lifting point and as a safety harness securing point.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exterior side view of a fan cylinder according to an embodiment of the invention.

FIG. 2 is an interior view of a fan cylinder according to an embodiment of the invention.

FIG. 3 is a plan view of a fan cylinder according to an embodiment of the invention

FIG. 4 is an elevation view of a basic segment of a fan cylinder according to an embodiment of the invention.

FIG. 5 is an elevation view of a motor segment of a fan cylinder according to an embodiment of the invention.

FIG. 6 is an elevation view of an access segment of a fan cylinder according to an embodiment of the invention.

FIG. 7 is an isometric view of a horizontal rib stiffener according to an embodiment of the invention.

FIG. 8 is a plan view of the horizontal rib stiffener of FIG. 7 .

FIG. 9 is a section view along line B-B of FIG. 10 .

FIG. 10 is a section view along line C-C of FIG. 8

FIG. 11 is another elevation view of a basic segment of a fan cylinder according to an embodiment of the invention.

FIG. 12 is a section view along line A-A in FIG. 11 .

FIG. 13 is a section view along line B-B of FIG. 11 .

FIG. 14 is a section view along line C-C of FIG. 11 .

FIG. 15 is a section view along line D-D of FIG. 11 .

FIG. 16 is a detail view of FIG. 11 showing the connection points for a horizontal rib stiffener.

FIG. 17 is a perspective view of a horizontal rib stiffener joining two adjacent segments of a fan cylinder according to an embodiment of the invention.

FIG. 18 is a plan view of a top ring stiffener according to an embodiment of the invention.

FIG. 19 is an isometric view of a top ring stiffener according to an embodiment of the invention.

FIG. 20 is another plan view of a top ring stiffener according to an embodiment of the invention.

FIG. 21 is a section view along line A-A of FIG. 20 .

FIG. 22 is an elevation view of a segment according to an embodiment of the invention.

FIG. 23 is a section view along line A-A of FIG. 22 .

FIG. 24 is a section view along line B-B of FIG. 22 .

FIG. 25 is a detailed view of a lifter bar according to an embodiment of the invention.

FIG. 26 shows detailed views 2 and 3 from FIG. 24 .

FIG. 27 shows detailed view 4 from FIG. 23 .

Features in the attached drawings are numbered with the following reference numerals:

1 cooling tower fan cylinder

3 basic segment

5 motor segment

7 access segment

9 fan blades

11 wall element

13 interior facing surfaces

15 exterior facing surfaces

17 integrally molded vertical rib

19 integrally molded horizontal ribs

21 flanges

23 horizontal rib stiffener

25 access slot

27 top ring stiffener

29 lifter bar

31 lifter cup holder

DETAILED DESCRIPTION OF THE INVENTION

The cooling tower fan cylinder 1 of the invention may be composed of multiple segments, including a plurality of basic segments 3, a motor segment 5 and an access segment 7. The segments 3, 5 and 7 are assembled to form a generally hourglass shaped cooling tower fan cylinder 1, see, e.g., FIG. 3 . The fan cylinder 1 according to the invention is configured to house and protect fan blades 9, reduce sound and vibration, and enhance performance.

The segments 3, 5 and 7 are preferably molded fiberglass composite structures, including a wall element 11 having interior 13 and exterior 15 facing surfaces. The interior facing surface 13 of the wall element 11 of each basic segment 3 is smooth and relatively featureless (with the exception in at least some instances of a lifting bar, discussed below). Referring to FIGS. 4 and 11-15 , the exterior facing surface 15 of the wall element 11 of each segment features integrally molded vertical 17 and horizontal 19 ribs that intersect with one-another at right angles. At their lateral edges, the segments have flanges 21 which are used to bolt the segments to one-another. See, e.g., FIG. 17 .

The fan cylinders 1 may further include a horizontal rib stiffener 23 which attaches at one end to a horizontal rib 19 a of one segment and at a second end to the corresponding horizontal rib 19 b of the adjacent segment. See FIGS. 4-10 and 17 . One horizontal rib stiffener 23 is preferably installed at every junction between adjacent segments. Optionally, two rib stiffeners 23 may be provided at each junction between adjacent segments to join two horizontal ribs 19 in the throat area of the fan cylinder 1, as shown in FIGS. 4-6 .

An access slot 25 may be provided at each end of a horizontal rib, bottom side, to facilitate bolting of the rib stiffeners 23 to the horizontal ribs 19 a and 19 b of adjacent segments, See FIGS. 11, 16 and 17 . A top ring stiffener 27 may be installed at the junction of each two adjacent segments in the top ring flange, see FIGS. 18-21 .

According to a further embodiment of the invention, at least three segments are provided with a lifter bar 29, accessible from the inside surface of the wall. See FIGS. 22-27 . The lifter bar 29 may be horizontally secured to a lifter cup holder 31 that is integrally molded inside a central vertical rib of the segment. The lifter bar 29 may be used to secure cables or straps to hoist an assembled fan cylinder into its final location. The lifter bar 29 may also be used to secure a safety harness for workers servicing equipment in the interior space defined by the fan cylinder. The height of the lifter bar 29 from the bottom of the segment may be situated for use both as a lifting point and as a safety harness securing point.

It is specifically contemplated that every feature embodiment disclosed herein may be used together with every other feature and embodiment disclosed herein.

The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the concept of a segmented cooling tower fan cylinder are intended to be within the scope of the invention. Any variations from the specific embodiments described herein but which otherwise segmented cooling tower fan cylinder should not be regarded as a departure from the spirit and scope of the invention set forth in the following claims. 

1. A cooling tower fan cylinder comprising: a plurality of modular standard segments; a motor segment configured to allow the passage of power and mechanical elements associated with driving a fan motor; an access segment configured to allow the passage of a technician into an interior of said cooling tower fan cylinder; said plurality of standard segments, said motor segment and said access segment configured to be assembled into said cooling tower fan cylinder; each of said plurality of standard segments, said motor segment and said access segment comprising on exterior facing surfaces a plurality of integrally molded vertical ribs and integrally molded horizontal ribs, said cooling tower fan cylinder further comprising a plurality of horizontal rib stiffeners configured to connect horizontal ribs on adjacent segments; a plurality of top ring stiffeners configured to connect top ring flanges on adjacent segments; a lifter bar provided inside a central vertical rib of each of three segments equally spaced about said cooling tower fan cylinder and configured to be access from an interior of said cooling tower fan cylinder.
 2. A method for assembling and mounting a modular fan cylinder on a cooling tower, said method comprising: assembling, at ground level, a plurality of standard fan cylinder segments; a fan cylinder motor segment, and a fan cylinder access segment into said modular fan cylinder by connecting adjacent segment flanges to one-another; wherein said plurality of standard fan cylinder segments, said fan cylinder motor segment and said fan cylinder access segment each comprise on exterior facing surfaces a plurality of integrally molded vertical ribs and integrally molded horizontal ribs; said method further comprising attaching horizontal rib stiffeners to integrally molded horizontal ribs of adjacent segments; attaching a hoisting rig to lifter bars arranged in at least three of said plurality of standard fan cylinder segments and accessible from an interior of said tower fan cylinder; lifting said modular fan cylinder using said hoisting rig and lifter bars, and placing said modular fan cylinder atop a cooling tower. 